TRILOBITES FROM THE UPPERMOST TORSUQTAGH GROUP (CAMBRIAN-ORDOVICIAN), SOUTHERN KURUKTAG AREA, XINJIANG
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Abstract:
Trilobites described in this paper were collected from the uppermost Torsuqtagh Group in Southern Yaerdang Mountains and Queerqueke Mountains, south of the Kuruktag area, Xinjiang by the 1st Regional Geological Surveying Team of Xinjiang in 1981 and by Lin Huan-ling and others of Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences in 1993. They consist of 9 species and 3 indetermined species, belonging to 10 genera and 2 subgenera. The uppermost Torsuqtagh Group can be subdivided into two trilobite zones: the lower part (corresponding to the conodont C.lindstroemi Zone) is assigned to the Hysterolenus Zone, and the upper part (equivalent to conodont C. angulatus Zone) Dichelepyge sinensis Zone. The former includes Hysterolenus oblongus Lisogor, Borthaspidella anderssoni (Troedsson), Niobe (Niobella) preciosa Lu et Z.Y.Zhou, Leiagnostus sanduensis Zhou, Proteuloma sp., Euloma sp., Dividuagnostus cf. longa (Ju) and Symphysurus (Troedssonia) sp. The latter comprises Dichelepyge sinensis Lu et Lin, Bienvillia cf. tetragonalis (Harrington), Prospectarix exquisita Zhou et al., Lotagnostus (s.1.) orientalis (Lu et Lin). Based on conodonts, the Cambrian-Ordovician boundary in the southern Kuruktag area may be fall within the Hysterolenus Zone.
